I am a teacher art Rutgers in NJ. I have a student with a T1-84. When she enters two functions in the "Y=" screen, only one graph is displayed. e.g, y1=x, y2=x^2, only the line y=x is displayed when she hits "Graph'. I looked at her settings and Modes, but couldn't see anything. How do we get both graphs to display?

Some time or other she played with the Transfrm Application. It remains in memory and takes over the graphing capabilities of the native OS. It must be kicked out of memory.

1. Press [APPS]
2. Use Up or Down arrows (Up is faster) to get to the bottom of the APPS list.
3. Locate [:Transfrm], highlight it and press [ENTER]
4. In subsequent screen, select the [UNINSTALL] option.
5. Go back to the [Y=] screen and enter or edit your functions.
6. Press [GRAPH] when finished entering the functions.

The Ti83/84PLUS are a lot more advanced than the TI-30XA because thaeu can graphs, statistics, calculus etc. But they lack a key for the % function, and a key for the fraction manipulation, the angle unit conversions (deg, radians, et grads) and they are a lot more expensive than the TI30XA.

Before your daughter finishes high school, you will eventually have to buy her a graphing calculator but right now a TI83/84Plus calculator seems like overkill. Besides some teachers may not let students have graphing calculators during exams.

Honestly I suggest you buy the TI-30XA Solar version. There are some new nifty calculators manufactured by Casio (Casio FX-115ES, FX-991ES, FX-300ES), Sharp (El-506W, 516W ). The beautiful thing about these new kinds of calculators is that you can configure them to use the Textbook display: equations and expressions can be entered as they would appear in textbooks. The Casios are called Natural Display and the Sharps are know as WriteView models.
In fairness to Texas Instruments, they too have calculators that incorporate that display format but I do not know the exact model numbers (maybe TI34XII multiview).

To clean the slate so to speak, just reset the RAM.

1. Press [2nd][+] to access the (MEM)ory management function
2. Press [7:Reset]
3. Press [1:All Ram]
4. Press [2:Reset]
5. Press [CLEAR] to erase the "RAM cleared" Message

Calc

A) Before drawing function Y1=f(X), R1=F(Theta), (X1=f(T), Y1=f(T))
you should turn the statistical plots OFF.
To turn statistical plots off

1. Press [2nd][Y=] to open the (STAT PLOT) menu.
2. Select [4:PlotsOff] and
   
3. Press [ENTER].
4. Calculator displays Done
5. Restart your graphs.
6. Adjust the window dimensions if necessary or use the ZOOM function to have all graphs displayed.
   

B) If you cannot draw more than one function

Usually as soon as you start entering an expression in the Y= editor screen, the = sign is highlighted to ensure the drawing of a function. However, if you have previously used the Transfm application to draw dynamic graphs, it takes over the graphing functionalities from the native OS and you can only draw a single graph.
The reason is that dynamic graphing needs one or two parameters that can be changed during the graphing process and the graph redrawn with a new value of a parameter, and you end up with a family of curves differing one from the other by the values of one parameters. But since the calculator has space for 10 graphs at most, only one function can be highlighted.

To make a long story short, you must uninstall the Transfrm application from memory. The procedure will not erase it, just kick it out of memory.

1. Press the [Apps] key.
   
2. Scroll down or up to reach the Transfmapplication.
   
3. Select it and press [ENTER].
   
4. If that application was running you will see a new screen that tells you some thing like
   
   • Transfrm App
   • 1:Uninstall
   • 2:Continue
   
   Press1:Uninstall.
   Graphing functionalities will revert to the native OS
   

Another potential culprit is the Inequalz App. You recognize that Inequalz is runnibg if the [ Y=] editor screen shows tabs at the bottom


To uninstall it, do as for the Transfm and select the option that will unload it from memory.

1. Press [Apps]
2. Select [ : Inequalz]
3. Screen displays Inequal RUNNING

• [1:Continue]
• [2:Quit Inequal]
• 3:About]

Press [2:Quit Inequal]

A) Before drawing function Y1=f(X), R1=F(Theta), (X1=f(T), Y1=f(T))
you should turn the statistical plots OFF.
To turn statistical plots off

1. Press [2nd][Y=] to open the (STAT PLOT) menu.
2. Select [4:PlotsOff] and
   
3. Press [ENTER].
4. Calculator displays Done
5. Restart your graphs.
6. Adjust the window dimensions if necessary or use the ZOOM function to have all graphs displayed.
   

B) If you cannot draw more than one function

Usually as soon as you start entering an expression in the Y= editor screen, the = sign is highlighted to ensure the drawing of a function. However, if you have previously used the Transfm application to draw dynamic graphs, it takes over the graphing functionalities from the native OS and you can only draw a single graph.
The reason is that dynamic graphing needs one or two parameters that can be changed during the graphing process and the graph redrawn with a new value of a parameter, and you end up with a family of curves differing one from the other by the values of one parameters. But since the calculator has space for 10 graphs at most, only one function can be highlighted.

To make a long story short, you must Uninstall the Transfrm application from memory. The procedure will not erase it, just kick it out of memory.

1. Press the [Apps] key.
   
2. Scroll down or up to reach the Transfmapplication.
   
3. Select it and press [ENTER].
   
4. If that application was running you will see a new screen that tells you some thing like
   
   • Transfrm App
   • 1:Uninstall
   • 2:Continue
   
   Press1:Uninstall.
   Graphing functionalities will revert to the native OS
   

Another potential culprit is the Inequalz App. You recognize that Inequalz is runnibg if the [ Y=] editor screen shows tabs at the bottom


To uninstall it, do as for the Transfm and select the option that will unload it from memory.

1. Press [Apps]
2. Select [ : Inequalz]
3. Screen displays INEQUAL RUNNING

• [1:Continue]
• [2:Quit Inequal]
• 3:About]

Press [2:Quit Inequal]

A) Before drawing function Y1=f(X), R1=F(Theta), (X1=f(T0, Y1=f(T))
you should turn the statistical plots OFF.
To turn statistical plots off

1. Press [2nd][Y=] to open the (STAT PLOT) menu.
2. Select [4:PlotsOff] and
   
3. Press [ENTER].
4. Calculator displays Done
5. Restart your graphs.
6. Adjust the window dimensions if necessary or use the ZOOM function to have all graphs displayed.
   

B) If you cannot draw more than one function

Usually as soon as you start entering an expression in the Y= editor screen, the = sign is highlighted to ensure the drawing of a function. However, if you have previously used the Transfm application to draw dynamic graphs, it takes over the graphing functionalities from the native OS and you can only draw a single graph.
The reason is that dynamic graphing needs one or two parameters that can be changed during the graphing process and the graph redrawn with a new value of a parameter, and you end up with a family of curves differing one from the other by the values of one parameters. But since the calculator has space for 10 graphs at most, only one function can be highlighted.

To make a long story short, you must Uninstall the Transfrm application from memory. The procedure will not erase it, just kick it out of memory.

1. Press the [Apps] key.
   
2. Scroll down or up to reach the Transfmapplication.
   
3. Select it and press [ENTER].
   
4. If that application was running you will see a new screen that tells you some thing like
   
   • Transfrm App
   • 1:Uninstall
   • 2:Continue
   
   Press1:Uninstall.
   Graphing functionalities will revert to the native OS
   

Another potential culprit is the Inequalz App. You recognoze that Inequalz is runnibg if the [ Y=] editor screen shows tabs at the bottom


To uninstall it, do as for the Transfm and select the option that will unload it from memory.

1. Press [Apps]
2. Select [ : Inequalz]
3. Screen displays INEQUAL RUNNING

• [1:Continue]
• [2:Quit Inequal]
• 3:About]

Press [2:Quit Inequal]

This usually happens after the statistical graphs have been used. You should deactivate them. Press [2nd][Y=] (STAT PLOT). Select [4:PlotsOff] [ENTER]. Calculator echoes Done on main screen.
Restart your graphs.

Hello,

1. TurnOff the STATPLOTS by pressing [2nd][STAT PLOT][4:PlotsOFF]. Command echoes on the home screen. Press ENTER. Screen displays Done

2. Run the command ClrAllLists to clear the lists. Press [2nd][Catalog] Scroll down till you reach the ClrAllLists command. Highlight and press [ENTER]. Command echoes on main screen, press [ENTER] to execute it. Screen displays Done

3. Make sure you are drawing the right type of graph. To check that press [MODE], scroll down to 4th line to highlight Func and press ENTER, if you are drawing y=f(x) functions. The others are PARametric, POLar, SEQuence.

The above procedures (the first two) are likely to solve your problem. In case that does not work reset the RAM.

Press [2nd][MEM][7:Reset][1:All ram][2:Reset] [ENTER]. Screen shows RAM cleared. Clear the screen and use [Y=] to enter the functions you want to graph.
Hope it helps.

If either error occurs when trying to graph a function (not a STAT PLOT), the error can be corrected by turning off the STAT PLOTS. The following steps will turn the STAT PLOTS off, allowing the graph of the function to be displayed.• Press [2nd] [Y=] to access the STAT PLOTS menu.
• Select 4: PlotsOff.
• Press [ENTER].
• Try graphing a function like y = x^4-3x^3+6x-1

Hello,

It is actually quite simple. The calculator can perform severa types of graphing, but the most common is the drawing of functions defined by a relation of the form y= fonction(x), or y=f(x) for short.

The procedure is described for the TI 89 Titanium. It is valid for the TI 89 except if I enter the color of a key.
1. Before you start, you should set up the calculator to begin a New Problem. The command for that is accessed through the menus.
Press the [HOME] key to go to main calculator folder.
In Home folder, press [2nd][F1] to access [F6][2:NewProb]. Press [ENTER] to execute the command. Screen should display Done.
2. Press yellow [Diamond] key (it is the equivalent of the CTRL key in computers) then [F1] to open the [Y=] editor.
3. Use the keypad to enter your first function on Y1= line. Press [ENTER] when finished with Y1. This will select the curve to be drawn, and a check mark appears to the left of the Y, in Y1=. If there is no check mark, the curve will not be drawn. If that happens, move cursor on Y1= and highlight it and press ENTER.
4. Enter the next function. Press [ENTER] when finished.

Try the functions Y1=3*x+0.5 and Y2=x^2 -1.

5. Press the yellow [Diamond] key to access [GRAPH]. The cartesian screen appears, the calculator starts graphing. While graphs are being drawn, the indicator BUSY is displayed at the bottom of the screen, on the right.

Here is what your screen looks like.

6. If BUSY indicator disappears, graphs are finished. If nothing is displayed on the screen except the axes, the functions may be out of range. In that case you can adjust the window dimensions.


You can change the values of Xmin, Xmax, Ymin, Ymax, or press [F2:Zoom] to use any of the zooming options.

This is the basic procedure to draw y=f(x) graphs.
Hope it helps.